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Sony SRF-18 Service Manual
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Sony SRF-18 Service Manual

Service manual - radio am/fm/external speake
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SERVICE MANUAL
Ver. 1.1 2012.03
SPECIFICATIONS
Frequency range:
FM: 87.5 MHz - 108 MHz
AM: 530 kHz - 1,710 kHz
Speaker:
7
Approx. 3.6 cm (1
/
inches) dia, 7.2
16
Input:
AUDIO IN jack ( 3.5 mm stereo minijack) (1)
Outputs:
(headphones) jack ( 3.5 mm stereo minijack) (1)
AUDIO OUT jack ( 3.5 mm stereo minijack) (1)
Power output:
80 mW + 80 mW (JEITA*)
Power requirements:
3 V DC, two size AA (R6) batteries
Dimensions:
Approx. 155 mm × 78.5 mm × 32.5 mm (6
(w/h/d, projecting parts not included)
Approx. 155.4 mm × 80.3 mm × 34.2 mm (6
(w/h/d, projecting parts included)
(JEITA*)
Mass:
Approx. 198 g (7 oz) (batteries included)
* JEITA (Japan Electronics and Information Technology Industries Association) standards.
Supplied accessories
Operating Instructions (1)
Audio connecting cable (stereo mini plug
Design and specifications are subject to change without notice.
On Copyrights
"WALKMAN" and "WALKMAN" logo are registered trademarks of Sony
Corporation.
9-893-410-02
Sony Corporation
2012C33-1
©
2012.03
Published by Sony Techno Create Corporation
(2)
1
/
inches × 3
1
/
inches × 1
5
/
inches)
8
8
16
1
1
3
/
inches × 3
/
inches × 1
/
inches)
8
4
8
stereo mini plug) (1)
SRF-18
NOTES ON CHIP COMPONENT REPLACEMENT
•
Never reuse a disconnected chip component.
•
Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
•
Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
•
Strong viscosity
Unleaded solder is more viscous (sticky, less prone to fl ow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
•
Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
FM STEREO/AM RADIO
E Model

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Summary of Contents for Sony SRF-18

  • Page 1 Usable with ordinary solder On Copyrights It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder. “WALKMAN” and “WALKMAN” logo are registered trademarks of Sony Corporation. FM STEREO/AM RADIO 9-893-410-02 Sony Corporation 2012C33-1 ©...

  • Page 2: Section 1 Disassembly

    SRF-18 SECTION 1 DISASSEMBLY • This set can be disassembled in the order shown below. 1-1. DISASSEMBLY FLOW 1-2. FRONT CABINET BLOCK (Page 3) 1-3. MAIN BOARD BLOCK (Page 4) 1-4. MAIN BOARD (Page 5) 1-5. KNOB (TUNE) 1-6. GEAR (VC)
  • Page 3 SRF-18 Note: Follow the disassembly procedure in the numerical order given. 1-2. FRONT CABINET BLOCK 2 three screws (1.7) When disassembling the unit, 1 Open the battery case lid. use the following jig. Part No. Description 9-913-402-33 Tool for Disassembly –...

  • Page 4: Main Board Block

    SRF-18 1-3. MAIN BOARD BLOCK 5 two screws (1.7) knob switch (power) (S501) 5 two screws battery terminal (+) (1.7) 6 Lift up the holder 5 screw (1.7) (headphone) block. 5 screw (1.7) Note: When installing the knob (power), 8 holder...

  • Page 5: Main Board

    SRF-18 1-4. MAIN BOARD 2 knob (band) qa MAIN board 4 screw (B) (1.4 1 two claws 5 screw (1.7) 6 chassis block 8 screw (1.7) 7 Remove the solder. 3 pointer 0 battery terminal (-) 9 holder (DC) pointer...
  • Page 6 SRF-18 1-5. KNOB (TUNE) 1 Cutting lack of a washer is united with boss and it inserts in the direction of an arrow. washer cutting lack 3 knob (tune) 1 washer boss chassis block 2 Washer is moved in the direction of an arrow 2 gear (midway) with tweezers.

  • Page 7: Electrical Adjustments

    SRF-18 SECTION 2 ELECTRICAL ADJUSTMENTS Connectiong and adjustment location: 0 dB = 1 V AM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level meter. FM 2ND OSC ADJUSTMENT L103 520 kHz Refer to the connecting location and adjustment location.
  • Page 8 SRF-18 SECTION 3 DIAGRAMS THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. • IC Block Diagrams (In addition to this, the necessary note is printed in each block.) – MAIN Board – For Printed Wiring Boards. For Schematic Diagrams.

  • Page 9: Printed Wiring Board

    SRF-18 3-1. PRINTED WIRING BOARD • : Uses unleaded solder. ANT1 FM TELESCOPIC ANTENNA L105 AM FERRITE-ROD ANTENNA MAIN BOARD D102 W101 TUNE D101 L101 S501 C104 S101 L102 R103 POWER C136 C251 C103 (FM IN) RADIO C105 L103 JW107...

  • Page 10: Schematic Diagram

    SRF-18 3-2. SCHEMATIC DIAGRAM • See page 8 for IC Block Diagrams. MAIN BOARD JW107 R301 C103 C102 L101 C106 L103 JW108 FM RF AM OSC JW301 R102 L102 R332 R352 C105 C112 2.2k L104 2.2k 2.2k 100p C136 4700p 0.01...

  • Page 11: Exploded Views

    SRF-18 SECTION 4 EXPLODED VIEWS Note: • -XX and -X mean standardized parts, so • The mechanical parts with no reference they may have some difference from the number in the exploded views are not sup- original one. plied. • Items marked “*” are not stocked since •...

  • Page 12: Chassis Section

    SRF-18 4-2. CHASSIS SECTION L105 MAIN D102 board Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 4-294-739-01 POINTER 3-318-201-61 SCREW (B) (1.4X6), TAPPING 4-294-730-02 CHASSIS 3-252-825-01 SCREW (1.7) 4-294-736-01 GEAR (MIDWAY) 4-294-742-01 TERMINAL (–) BATTERY 4-294-734-01...

  • Page 13: Rear Cabinet Section

    SRF-18 4-3. REAR CABINET SECTION ANT1 supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 4-142-818-01 BATTERY TERMINAL +– (A) 4-294-728-21 LID, BATTERY CASE (for PINK) 3-014-055-01 FOOT, RUBBER 2-596-904-01 CUSHION (LEVER) 4-294-727-32 CABINET REAR (for BLACK)

  • Page 14: Section 5 Electrical Parts List

    SRF-18 SECTION 5 MAIN ELECTRICAL PARTS LIST Note: • SEMICONDUCTORS • Due to standardization, replacements in • RESISTORS In each case, u: μ, for example: the parts list may be different from the All resistors are in ohms. uA. .
  • Page 15 SRF-18 Ver. 1.1 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < JUMPER RESISTOR > R354 1-216-801-11 METAL CHIP 1/10W R355 1-216-864-11 SHORT CHIP JC101 1-216-864-11 SHORT CHIP R401 1-216-809-11 METAL CHIP 1/10W JC102 1-216-864-11...

  • Page 16: Revision History

    SRF-18 REVISION HISTORY Checking the version allows you to jump to the revised page. Also, clicking the version at the top of the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2012.02 2012.03...

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